The National One Coat Stucco Association has developed a Reference Guide for One Coat Stucco.

The Guide contains generic information of importance to Architects, Specifiers and others in developing documents for a stucco project. It will also be of importance to Builders, Contractors and Applicators.

The manual is designed to put forth the most efficient procedures and to have sufficient details that are acceptable to the Industry.

In addition to a Generic Specification some of the special sections of the guide includes:

  • Pre Inspection of Job Site
  • Installation and Procedures
  • Flashing
  • Substrates
  • Moisture Barrier
  • Lath / Fastening
  • Mixing
  • Applications
  • Floating
  • Finishes
  • Flashing Windows
The 2015 edition will be available at a later date.

October 2008

The National One Coat Stucco Association (NOCSA) has completed extensive laboratory testing to develop performance criteria to verify One Coat Stucco performance of the Drainage Plane.

The purpose of this test program was to demonstrate that for One Coat Stucco Systems where a weather resistive barrier, meeting the requirements of Section 1404.2 of the 2006 International Building Code, is installed behind the EPS foam, adequate drainage of infiltrating of water occurs.

The tests were performed by NOCSA and its members to meet new requirements of the International Code Council Evaluation Service (ICC-ES), for the Drainage Plane located behind cementitious exterior wall coverings. The revised acceptance criteria AC11 was approved by the ICC-ES Committee on June 7, 2007 and was effective July 1, 2007.

The Specialized Testing of Santa Fe Springs, California was contracted by Ron Ogawa of Ronald Ogawa & Associates, Inc., to conduct the tests. Ogawa served as the test program consultant for NOCSA and supervised the tests.

The ICC-ES is requiring Evaluation Reports issued on or after the effective date of July 1, 2007and falling within the scope of this criteria to comply with the revised criteria - AC11 - 3.2.10.

Evaluation reports issued prior to the effective date may be in compliance either with the new acceptance criteria or with the previous edition. However, those based on a superseded version must be brought in compliance with the new criteria at the time the reports are reissued.

Members of NOCSA who participated in this test program are eligible to utilize the report of the testing with a Letter of Authorization from the Executive Director of NOCSA.

Effective July 1, 2007 the International Code Council Evaluation Service (ICC-ES) has revised AC11, section 3.2.10 to read:

"3.2.10 Weather-resistive Considerations: A water-resistive barrier complying with Sections 3.1.13 and 3.2.7 of this criteria is required under the exterior wall coating, except where coating system has been specifically recognized without barrier. The water-resistive barrier shall not be installed over the foam insulation board.

Details shall be submitted of a drainage system based on drainage performance testing. The applicant must submit a testing a proposal to ICC-ES prior to testing. Precedent for a testing procedure can be found in the ICC-ES Acceptance Criteria for EIFS Clad Drainage Wall Assemblies (AC235), Section 4.10.

In addition to a weather-resistive barrier complying with Section 3.1.13 of this criteria, the coating and lath may be applied over a water-resistive coating, complying with the ICC-ES Acceptance Criteria for Trowel-, Spray- or Roller-applied Water Resistive Coatings Used as Weather Resistive Barriers Over Cementitious Exterior Wall Coatings (AC209), applied over existing cementitious coatings."